Hi Marc,
As Dan stated, the first step is to connect to a dummy load and verify that the current in receive mode is less than 140ma.? If not, you will need to remove the 4 BS170 MOSFETS and try again.?
Once the receiver works, you can test the low-pass filter selection by measuring the voltage on each of the 6 switching diodes D1,2,3,4,5, and 6.? The banded side of the diode (cathode) should read zero volts for the two diodes that select the band chosen.? The other four should be close to or above 5volts.? This should be done whit a dummy load connected.? You change bands using the RF Sweep function in the terminal program.
You can now go on to test the transmitter into a dummy load.? Do not install the 4 MOSFETs yet.? First, verify that there is 2.5volts DC on each of the 4 BS170 gate pins while transmitting using the terminal transmitter test program.? If you do not have 2.5volts on all 4 drain pads, you will need to replace IC5.
After you have verified IC5, measure the resistance between the source and drain on each of the BS170 MOSFETs.? It should be high.? I would guess over 1kohms, but I have not measured it.? If that checks out, reinstall the 4 BS170s and test the power output into the dummy load for each band.? It is also a good idea to measure current while transmitting (it might be hard to do when using your only DDM to measure power out).
Let us know if you find and fix the problem or the results of your tests if the problem is not solved.
The above are my recommendations.? I do not warrant that it is the best way to test.? It is what I have done in the past.
73
Evan
AC9TU
